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Mineral Nutrition

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  1. Which of the following is a free living aerobic nonphotosynthetic nitrogen-fixer?
    1. Rhizobium
    2. Azotobacter
    3. Azospirillum
    4. Nostoc
Correct Option: B

Rhizobium is a symbiotic nitrogen fixer. Azospirillum is a nitrogen fixing fungus and Nostoc is anaerobic.


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